The U.S. Supreme Court on Thursday declined to block enforcement of an anti-money laundering law that forces millions of business entities to disclose the identities of their real beneficial owners to the Treasury Department,

The Corporate Transparency Act, which requires businesses to disclose ownership information, was blocked by a federal judge as beyond Congress’s authority.

The Supreme Court on Thursday revived a requirement that owners of millions of small businesses register with an arm of the Treasury Department charged with fighting money laundering and other financial crimes.